A running toilet can waste 200 gallons a day — here's the fix

Most running toilets are a bad flapper, fill valve, or overflow tube — not a mystery.

Flapper, fill valve, overflow tube

The flapper seals the tank drain. When it warps or gets coated in scale, water leaks into the bowl constantly — you hear the tank refill every few minutes. The fill valve controls tank level; if it's set too high, water spills into the overflow tube and never stops. Replace the flapper first — it's five dollars and fixes most runs. If that doesn't hold, the fill valve is next.

How to confirm with a dye test

Put a few drops of food coloring in the tank without flushing. Wait fifteen minutes. If color appears in the bowl, the flapper isn't sealing. If the tank level is above the overflow tube mark, adjust or replace the fill valve. This takes two minutes and tells you which part to buy before you disassemble anything.

Safe DIY vs when to call

Flappers and fill valves are reasonable DIY if you shut off the supply, flush to empty the tank, and match the part size. Cracks in the tank or bowl, water on the floor around the base, or a wobbly toilet from a rotted flange need a pro — wax rings and closet bolts are not the place to learn on YouTube at 10 p.m. We carry standard repair kits on the truck.

Water bill impact and when replacement wins

A silent run can waste hundreds of gallons a day — you'll see it on the bill before you hear it. If the toilet is 20 years old, has a cracked tank lid, and needs a third repair kit, a new efficient unit often costs less than a year of wasted water. We install standard and comfort-height models same-day when the floor flange is sound.